Abbreviation of an anglo saxon name: WarwickThe meaning of the name in anglo saxon roughly translates to "Valiant Defender"
In Austrailian "lingo" it is derogatory as they are lazy speakers so, often words get squashed or aussified. Also there is a tendancy to use names in derogatory manner in Australia
Wanker becomes Wazza as often alcohol is involved in the arival of the barstardisation} in the first place
Dick = a penis or dullard
Norm = Straight or follows the rulz
Bob = nervous or very active
Mary = gay or any none "normal" sexual attitude

Geeze Norm you wouldn' wanna know that Dick he is a real Wazza. Bit of a Bob also eh! I recon he is a bit of a friggin Mary ,bloody Wazza .